Comparison of flicker noise in single layer, AMR and GMR sandwich magnetic film devices

Flicker noise comparison has been made on single layer NiFeCo, Sandwich AMR NiFeCo/TaN/NiFeCo and GMR NiFeCo/CoFe/Cu/CoFe/NiFeCo films. In a single magnetic domain state, AMR films have noise close to the thermal noise, GMR has 2-3 times higher noise, and in a state having a useful MR ratio, the GMR film has 10 times higher noise than AMR sandwich film, while the sandwich film has 10 times higher noise than single layer AMR film.